add_index(table_name, column_name, options = {})
public

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# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 486
        def add_index(table_name, column_name, options = {}) #:nodoc:
          index_name, index_type, index_columns, index_options, index_algorithm, index_using = add_index_options(table_name, column_name, options)
          execute "CREATE #{index_type} INDEX #{index_algorithm} #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} #{index_using} (#{index_columns})#{index_options}"
        end